CONE SNAIL: This pokey predator makes up for its lack of speed with one of the strangest hunting systems in the sea. Since it's too slow to chase down fish and other prey, the cone snail prefers to paralyze its victims with a poisonous "harpoon." The poison, or venom, is made in a long, tubular duct. The duct has a muscular bulb at one end and empties into the proboscis — a slender, tubular feeding organ. The harpoon — a hollow, spear-like tooth — is made in a cavity called the radular sac. When a tooth is ready, it is transported to the tip of the snail's proboscis and pumped full of venom. The cone snail detects prey with chemoreceptors in its siphon, or breathing organ. When a fish, worm or mollusk wanders too close, the snail extends its long proboscis and fires the venomous, harpoon-like tooth into its prey. The tooth is attached to the snail via a thread or filament, tethering the prey so that it can't swim away. The venom acts quickly, immobilizing the prey in a matter of seconds. Then the thread is retracted and the snail engulfs its meal through an opening at the tip of its proboscis.